Livewire (networking)
| Livewire | |
|---|---|
 | |
| Manufacturer Info | |
| Manufacturer | Axia Audio, a division of Telos Systems |
| Development date | 2003 |
| Network Compatibility | |
| Switchable | Yes |
| Routable | Yes |
| Ethernet data rates | Fast Ethernet, Gigabit Ethernet |
| Audio Specifications | |
| Minimum latency | 0.75 ms[1] |
| Maximum sampling rate | 48 kHz[2] |
| Maximum bit depth | 24 bits[2] |
Livewire is an audio over Ethernet system created by Axia Audio, a division of Telos Systems. Livewire was introduced in 2003 and is used primarily in radio station applications. Designed as a superset of functionality utilising common protocols and formats, Livewire is available as an open standard through Axia's partner program[3][4] and is interoperable with other RAVENNA standards-based systems and equipment.
Benefits
Livewire provides "anywhere to anywhere" routing of audio, using multicast sources and destinations of uncompressed PCM or AAC audio globally visible on a LAN. Audio is carried using standard ethernet 8-conductor cables and RJ-45s, which are smaller than XLR interconnects, improving flexibility while reducing the amount of wiring required for installations.[5]
Protocol
The following table lists ports and protocols used in Livewire systems.[6][7][8]
| Port | Protocol | Multicast Address | Purpose | Notes |
|---|---|---|---|---|
| 67, 68 | UDP | BOOTP Server/Client | Remote IP address assignment | |
| 93 | TCP | Livewire Routing Protocol | Also provides transparent passing of custom messages, similar to the Ancillary Data Transmission feature of AES3 | |
| 123 | UDP | Network Time Protocol | ||
| 514 | UDP | Syslog | Activity logging to a syslog receiver. | |
| 2055 | UDP | 239.192.255.4 | Multicast-based GPIO (CMsg2 protocol) | GPIO commands, GPIO node → console-type endpoint |
| 2060 | UDP | 239.192.255.4 | Multicast-based GPIO (CMsg2 protocol) | GPIO commands, console-type endpoint → GPIO node |
| 4000 | UDP | Livewire Advertisement and Source Allocation Protocol | Verbose advertisement and source allocation requests | |
| 4001 | UDP | 239.192.255.3 | Livewire Advertisement and Source Allocation Protocol | Periodic and verbose announcements;
Source allocation state announcements and responses |
| 4002 | UDP | 239.192.255.3 | Engine Supervision Protocol | |
| 4010 | TCP | Livewire Control Protocol | ||
| 4011 | UDP | 239.192.255.4 | LWCP for Accessory Modules | Module → Console |
| 4012 | UDP | 239.192.255.3 | LWCP for Accessory Modules | Console → Module |
| 5004 | UDP | 239.192.x.x | RTP Livewire Audio | Last two address octets pertain to Axia channel ID, e.g. 9999 = 39 15 (hex 27 0F) |
| 7000 | UDP | Livewire Clock | One device assigns itself as LAN-wide reference, all other devices slave to it | |
| 9997 | TCP | Protocol logging | Debug protocol logging for Element |
References
- ↑ "Best Practices in Network Audio" (PDF). Audio Engineering Society. 2009. Retrieved 2010-05-05.
- ↑ 2.0 2.1 Introduction to Livewire, Axia Audio, April 2007, retrieved 2011-06-21
- ↑ Axia Debuts Livewire Limitless License, Radio, 2011-04-07, retrieved 2011-07-10
- ↑ "Axia partners". Axia Audio. Retrieved 22 June 2011.
- ↑ Matt Rockwell (2011-07-01). "Axia Audio Element Leads New Studio". Radio World. Retrieved 2011-07-10.
- ↑ "Configuring Windows Firewall for use with the Axia IP-Audio Driver". Axia audio. 31 October 2006. Retrieved 5 November 2013.
- ↑ "Axia IP-Audio Driver for Windows, rev. 2.5 manual". Axia audio. August 2010. Retrieved 5 November 2013.
- ↑ Steve Church; Skip Pizzi (10 September 2012). Audio Over IP: Building Pro AoIP Systems with Livewire. CRC Press. pp. 4–. ISBN 978-1-136-03057-4.